Avalanche Forecast

Issued: Jan 9th, 2012 8:20AM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs and Persistent Slabs.

Avalanche Canada jfloyer, Avalanche Canada

Summary

Confidence

Good - -1

Weather Forecast

A ridge of high pressure sets up over this region for Tuesday and Wednesday, bringing dry, clear weather. Treeline temperatures will hover around -8 to -10C. Winds should be generally light from the north. On Thursday, clouds will start to build ahead of a relatively weak frontal system, winds will shift round to the west and temperatures will increase to around -2C. Flurries are possible, more likely it will stay dry.

Avalanche Summary

No avalanches have been reported recently from this region.

Snowpack Summary

The upper snowpack comprises a series of storm snow layers, which have generally bonded well to each other and are now gaining strength. Rain to approximately 1800 m has left behind a moist surface layer--expect this to freeze into a crust as temperatures start to fall. In the alpine, above the elevation where rain fell, significant new wind slabs have developed in response to very strong southwesterly winds. Concern for lower snowpack layers remains only in low snowpack areas, such as the east side of the Duffy or in the Chilcotins. Surface hoar and/or facets associated with a crust from mid-December and/or sugary facets at the base of the snowpack could be a concern in sheltered treeline areas that are unusually shallow or on slopes where you can see rocks poking up out of the snow.

Problems

Wind Slabs

An icon showing Wind Slabs
Watch for wind slabs in the immediate lee of ridge crests.

Aspects: North, North East, East, South East, South.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

1 - 4

Persistent Slabs

An icon showing Persistent Slabs
Primarily a concern in the northern part of the region. Difficult to trigger but areas that are more likely are shallow, rocky high elevation areas that have stayed cold.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Possible

Expected Size

2 - 6

Valid until: Jan 10th, 2012 8:00AM

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